converter/pc98_usb/matrix.c

   1 /*
   2 Copyright 2012 Jun Wako <wakojun@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <stdint.h>
  19 #include <stdbool.h>
  20 #include <avr/io.h>
  21 #include <util/delay.h>
  22 #include "print.h"
  23 #include "util.h"
  24 #include "matrix.h"
  25 #include "debug.h"
  26 #include "protocol/serial.h"
  27
  28
  29 /*
  30  * Matrix Array usage:
  31  *
  32  * ROW: 16(4bits)
  33  * COL:  8(3bits)
  34  *
  35  *    8bit wide
  36  *   +---------+
  37  *  0|00 ... 07|
  38  *  1|08 ... 0F|
  39  *  :|   ...   |
  40  *  :|   ...   |
  41  *  E|70 ... 77|
  42  *  F|78 ... 7F|
  43  *   +---------+
  44  */
  45 static uint8_t matrix[MATRIX_ROWS];
  46 #define ROW(code)      ((code>>3)&0xF)
  47 #define COL(code)      (code&0x07)
  48
  49 static bool is_modified = false;
  50
  51
  52 inline
  53 uint8_t matrix_rows(void)
  54 {
  55     return MATRIX_ROWS;
  56 }
  57
  58 inline
  59 uint8_t matrix_cols(void)
  60 {
  61     return MATRIX_COLS;
  62 }
  63
  64 void matrix_init(void)
  65 {
  66     print_enable = true;
  67     debug_enable = true;
  68
  69     PC98_RST_DDR |= (1<<PC98_RST_BIT);
  70     PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
  71     PC98_RTY_DDR |= (1<<PC98_RTY_BIT);
  72     PC98_RST_PORT |= (1<<PC98_RST_BIT);
  73     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  74     PC98_RTY_PORT |= (1<<PC98_RTY_BIT);
  75
  76     DDRD |= 1<<7;
  77
  78
  79     serial_init();
  80
  81     // PC98 reset
  82     PC98_RST_PORT &= ~(1<<PC98_RST_BIT);
  83     _delay_us(15);
  84     PC98_RST_PORT |= (1<<PC98_RST_BIT);
  85     _delay_us(13);
  86     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
  87
  88     // PC98 ready
  89     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
  90
  91     // initialize matrix state: all keys off
  92     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
  93
  94     debug("init\n");
  95     return;
  96 }
  97
  98 uint8_t matrix_scan(void)
  99 {
 100     is_modified = false;
 101
 102     uint8_t code;
 103     PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
 104     _delay_us(30);
 105     code = serial_recv();
 106     PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
 107     if (!code) return 0;
 108
 109     debug_hex(code); debug(" ");
 110
 111 /*
 112     switch (code) {
 113         case 0x7E:  // reset fail
 114         case 0xFE:  // layout
 115         case 0xFF:  // reset success
 116             _delay_ms(500);
 117             // ignore response byte
 118             debug("(response ignored:");
 119             while ((code = serial_recv())) { debug(" "); debug_hex(code); }
 120             debug(") ");
 121             // FALL THROUGH
 122         case 0x7F:
 123             // all keys up
 124             for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 125             return 0;
 126     }
 127
 128     if (code&0x80) {
 129         // break code
 130         if (matrix_is_on(ROW(code), COL(code))) {
 131             matrix[ROW(code)] &= ~(1<<COL(code));
 132             is_modified = true;
 133         }
 134     } else {
 135         // make code
 136         if (!matrix_is_on(ROW(code), COL(code))) {
 137             matrix[ROW(code)] |=  (1<<COL(code));
 138             is_modified = true;
 139         }
 140     }
 141 */
 142     return code;
 143 }
 144
 145 bool matrix_is_modified(void)
 146 {
 147     return is_modified;
 148 }
 149
 150 inline
 151 bool matrix_has_ghost(void)
 152 {
 153     return false;
 154 }
 155
 156 inline
 157 bool matrix_is_on(uint8_t row, uint8_t col)
 158 {
 159     return (matrix[row] & (1<<col));
 160 }
 161
 162 inline
 163 uint8_t matrix_get_row(uint8_t row)
 164 {
 165     return matrix[row];
 166 }
 167
 168 void matrix_print(void)
 169 {
 170     print("\nr/c 01234567\n");
 171     for (uint8_t row = 0; row < matrix_rows(); row++) {
 172         phex(row); print(": ");
 173         pbin_reverse(matrix_get_row(row));
 174         print("\n");
 175     }
 176 }
 177
 178 uint8_t matrix_key_count(void)
 179 {
 180     uint8_t count = 0;
 181     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 182         count += bitpop(matrix[i]);
 183     }
 184     return count;
 185 }